I've got an account that is typically used to stow money away for gifts for my wife. She's no business knowing the cost of her gifts.
The account has her name and everything, but she typically doesn't use it (except for making international bank transfers). However, it also makes it quite convenient to hide the cost of my lenses - she's quite happy not being aware of the cost so it works out well.
And I just purchased the DA 15mm! I think I'll heed farfisa's advice and not take portraits of her with that one.
But, it'll work out great for our upcoming camping trip.